i-v iii iio iip iir iis iki ikk iko ikr iks ikv io- ioi ioo iop ior ios iov ipi ipo ipp ipr ips ipv ipy ir- iri irk iro irp irr irs irv iry is- isi isk iso isp isr iss isv isy ivi ivo ivp ivr ivs ivv ivy iyo iyr iys iyy kii kik kio kip kir kis kiv kki kkk kkp kkr kks kkv kky koi kok koo kop kor kos koy kpi kpk kpo kpp kpr kps kpv kri krk kro krp krr krs krv kry ksi ksk kso ksp ksr kss ksv kvi kvk kvo kvp kvr kvs kvv kyo kyp kyr kys o-i oii oik oio oip oir ois oiv oki okk oko okp okr oks oo- ooi ook ooo oop oor oos oov op- opi opk opo opp opr ops opv opy or- ori ork oro orp orr ors orv ory os- osi osk oso osp osr oss osv ov- ovi ovo ovp ovs ovv oyi oyo oys p-p pii pik pio pip pir pis piv pki pko pkp pkr pks pky poi pok poo pop por pos pov poy ppi ppk ppo ppp ppr pps ppv pri prk pro prp prr prs prv pry ps- psi psk pso psp psr pss psv psy pvi pvk pvo pvp pvr pvs pvv py- pyk pyo pyr pys rii rik rio rip rir ris riv riy rkk rko rkp rks rkv rky roi rok roo rop ror ros rov roy rpi rpk rpo rpp rpr rps rpv rri rrk rrp rrr rrs rsi rsk rso rsp rsr rss rsv rvi rvo rvp rvr rvs rvv rvy ry- ryk ryo ryr rys ryy sii sik sio sip sir sis siv sk- ski skk sko skp skr sks sky soi sok soo sop sor sos sov soy spi spk spo spp spr sps spv spy sr- sri srk sro srp srr srs srv sry ss- ssi ssk sso ssp ssr sss ssv svi svk svo svp svr svs svv svy sy- syi syk syp syr sys vi- vii vik vio vip vir vis viv viy vkp voi vok voo vop vor vos vov voy vpi vpk vpo vpp vpr vps vri vrk vrp vrr vrs vry vsi vsk vso vsp vsr vss vsv vvi vvo vvr vvs vvv vyp yii yio yip yir yis yki ykk yoi yok yoo yop yor yos yoy ypo yps yro yrp yrs ysi ysk yso ysp ysr yss ysy yvi yvo yvr yvy yys yyy